Stop collar



May 27, 1958 J. E. HALL, sR

STOP COLLAR Filed June 9, 1954 2 Sheets-Sheet J gay. a.

BY g

Tram/EK May 27, 1958 J. E. HALL, SR

STOP COLLAR Filed June 9, 1954 i I Humm lig;

2 Sheets-Sheet 2 Eff- 1f INVENTOR. c/ee 5 Ha@ .5ft

Unite This invention relates to improvements in stop collars forapplying oil well tools to the exterior of casing or pipe, and refersmore particularly to a stop collar construction which may be iixedlyattached to oil well casing, tubing, or pipe for the purpose of locatingand holding in a predetermined and desired position tools to be mountedon the ex erior of the pipe or casing.

Where it is necessary to mount tools useful in the drilling, completion,cementing or producing of oil wells on the casing, pipe or tubing runinto the well, it has been conventional practice to employ frictionalattachment of one sort or another, attachment by welding, or the weldingof stops or lugs above and below the tools to position the tools alongthe pipe or casing at desired locations. The instant invention providesa stop collar designed to avoid the necessity of welding operationsheretofore used and at the same time offers a construction which ispositive and sufhciently rugged to withstand the abuse to which it issubjected with little likelihood of failure.

An object, therefore, of the invention is to provide a stop collarconstruction which is useful to mount oil tools such as scratchers andcentralizers on oil well casing or pipe and avoid the necessity ofwelding the tools t the pipe or welding lugs or stops to the pipe inorder to mount the tools.

Another object of the invention is to provide a stop collar constructionadapted to be rigidly attached to the casing, pipe or tubing by thesimple operation of inserting wedge pins between the collar and casingor pipe.

A further object is to provide a stop collar utilizing wedge pins forits attachment to the casing or pipe, the collar itself serving as aprotective cover or armored enclosure over the holding pins.

Other objects and advantages will become apparent from the descriptionand explanation which follows.

In the accompanying drawings which form a part of the instantspecification and are to be read in conjunction therewith there areshown embodiments of the invention in which like reference numeralsindicate like parts in the various views.

Fig. l is a plan view of a stop collar employing diagonally insertedwedge pins.

Fig. 2 is an elevational view of the device shown in Fig. l with partsin section.

Fig. 3 is a detail of one of the wedge pins shown in Figs. l and 2.

Fig. 4 is a view taken along the line 4 4 in Fig. 2, in the direction ofthe arrows.

Fig. 5 is a view taken along the line 5--5 in Fig. 2, in the directionof the arrows.

Fig. 6 is an elevational view of a modified construction.

Fig. 7 is a horizontal sectional view taken along the line 7-7 in Fig.6.

Fig. 8 is a vertical section taken along the line 8 8 in Fig. 7.

Fig. 9 is a detail of a modied type of wedge pin.

rates Patent ice tially 180 apart and each of the passageways of thepairs extending circumorbitally of the collar and pipe in oppositedirections so that two of the wedge pins 12 of each of the pairs ofwedge pins are inserted into the passageways will extend in the samedirection, and the v other two wedge pins of the respective pairsinserted in the opposed passageway likewise extend in the same directionaround the casing or pipe. The wedge pins preferably have enlarged headsshown at 12a which abut the upper rim of the collar and limit the extentto which they are insertable in the grooves 11a. The pointed or tailends of the wedge pins are notched as shown at 12b to hook onto thelower rim of the collar when the pins have been driven home in theirgrooves, thus preventing displacement of the pins or their working loosein the collar. The wedge pins are preferably crescent shape in crosssection and are inserted in the grooves so the rounded surfaces of thepins conform with the inner contour of the grooves, while the sharpedges bite into the exterior surface or periphery of the pipe as shownin Figs. 2, 4 and 5. Since the grooves have a tapered depth to conformwith the taper of the pins and since the pins have a driving it in thegrooves, when the pins have been advanced so notches 12b are engagedwith the lower rim of the collar, the sharp edges of the pins uniformlygrip the exterior of the pipe.

n the modified construction shown in Figs. 6 to 8 inclusive, in place ofthe diagonal grooves formed in the collar the medial section of thecollar is arched as shown at 11b to form a single circumferentiallyextending passageway in the collar, shown best in Figs. 6, 7 and 8. lnthis arched passageway are punched out slotted apertures 11C. Thepunched out sections of the collar which form the apertures are turnedback in the form of tabs or tongues 11d The wedge pins 13 used in themodified type of collar shown in Figs. 6, 7 and 8 may be of crescentshape in cross section with notched or hooked ends 13a, as shown in Fig.8, or circular in cross section with iiuted exterior, as shown at 14 inFigs. 9 and 10. Smaller holes or apertures 11e are punched out of thecollar to facilitate locating the ends of the pins and as locking meansfor the pins by engagement with notches 13a.

To mount the stop 'collar shown in Figs. l and 2 on a casing or pipewith the wedge pins 12 removed, the collar is slipped along the pipe tothe desired position. Wedge pins 12 are then inserted in the grooves ilaand are driven home by means of a hammer until the hooks or notches 12bengage the lower rim of the collar, at which time the edges of the pinsbite into the exterior of the pipe 1t) and hold the collar rigidly inplace. ln this fashion the collar may be located at any position and isimmovably fixed on the pipe at any desired location.

To mount the modified type collar shown in Figs. 6, 7 and 8, tongues ortabs 11d are bent back to the position shown in the upper half of Fig.7. Wedge pins 13 are then inserted from opposite directions and drivenhome into the passageway or tunnel 11b formed in the medial sectionuntil the notched ends 13a of the pins 13 engage the edges of lockingapertures 11e, as shown in Fig. 7. When the pins have been driven to thepositions shown Patented May 27, 1,9*58

in the upper half of Fig. 7,V the vhead ends are bent down against thepipe and tabs 11d closed as shown in the lower half of Fig. 7 to presenta smooth circular surface about the entire exterior of thecollan In thistype construction as before the/sharp edges'of the wedge pinsL groovethe exterior of the pipe due to the fact that the passageway 11b is ofsomewhat lesser height Vthan the thick- @whichv are crescent shape incross section.

From the foregoing, it will be seenv that there has been providedstopcollars of relatively simple ruggedv construction adapted to be' rigidlyattachedrto pipes. The wedging elements besides assuring fixedattachment of the Vcollar to the Ypipe are locke-d against displacementand protected from abrasive wear by the collar itself.V

As many possible yembodiirients may be madeV of the, invention withoutdeparting from theV scope thereof, it` is to be Vunderstood that allVmatter' herein set forth Vor shown in the Vdrawingsfis to be(interpreted as illustrative and notinalimiting sense. i

Having tlius described my iY vention, I claim :`Y Y Apparatus of thecharacter described,V comprising a weil casing or pipe Vhaving asmoothcylindrical exterior,

a generally cylindrical collar encircling said casing in-V Y termediateits ends, the bore of said Vcollar containing a plurality of separategrooves, each extending part way around said casing along apath'o'riented spirally relative to the axis thereof, said paths havinga left-hand spiral Y pitch in the ease of some of said grooves and aright-` hand spiral pitch in the case of the remainder of said Ygrooves, and a plurality of spirally oriented wedge pins,

each received in one of said grooves with a longitudinal portion of thepinbearing tightlyk against the exterior f of the casing.

References Cited in the tilerof this patent VUNITED 'STATES PATENTS545,066 Fregeau Aug. 27, 1895 650,154 Owens May 22, 1900 709,510 PostSept. 23, V1902 1,740,308 Kraber Dec. 17, 1929 2,013,660 Lauer Sept. 10,1935 t 2,397,585 Anderson Apr. 2, 1946 2,597,482 Harrison et al May 20,17952 2,645,513 Sterrett July 14,1953 2,717,789 Taylor Sept. 13, 1955FOREIGN PATENTS 115,529 Australia July 14, 1942v 4,685 GreatBritainVMar. 5, 1901 969,217V

YFrance May 17, 1950

